Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a média de Larry Centers quando havia menos de 600 jardas?
 ###Tabelas: CREATE TABLE expansion_draft_selections (expansion_draft_selections_id AUTO_INCREMENT PRIMARY KEY, Pick INT, Player VARCHAR, Nationality VARCHAR, New WNBA Team VARCHAR, Former WNBA Team VARCHAR, College/Country/Team VARCHAR) CREATE TABLE house_of_schleswig-holstein-sonderburg-glücksburg (house_of_schleswig-holstein-sonderburg-glücksburg_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Birth VARCHAR, Marriage VARCHAR, Became Consort VARCHAR, Ceased to be Consort VARCHAR, Spouse VARCHAR) CREATE TABLE season_by_season (season_by_season_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, League VARCHAR, Finish VARCHAR, Wins VARCHAR, Losses VARCHAR, Pct. VARCHAR) CREATE TABLE club_representative_appearances (club_representative_appearances_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Nationality / Opponent VARCHAR, Ground VARCHAR, Result VARCHAR, Competition VARCHAR) CREATE TABLE receiving (receiving_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Number INT, Yards INT, Average INT, Long INT, Touchdowns INT)  
SELECT AVG Number FROM receiving WHERE Player = larry centers AND Yards < 600